[PHP知识库]Java获取真实Ip地址

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    /**
     * 获取Ip
     *
     * @param request  请求
     */
    public static String getIpRequest(HttpServletRequest request) {
        String unknown = "unknown";

        String ip0 = request.getHeader("x-forwarded-for");
        String ip = request.getHeader("X-Real-IP");

        if (ip == null || ip.length() == 0 || unknown.equalsIgnoreCase(ip)) {
            ip = request.getHeader("Proxy-Client-IP");
        }

        if (ip == null || ip.length() == 0 || unknown.equalsIgnoreCase(ip)) {
            ip = request.getHeader("WL-Proxy-Client-IP");
        }

        if (ip == null || ip.length() == 0 || unknown.equalsIgnoreCase(ip)) {
            ip = request.getRemoteAddr();
        }

        if (LOCAL_IP.equals(ip)) {
            ip = "local";
        }

        return ip;
    }

使用x-forwarded-for的话ip容易被伪造,

使用postman也可以模拟复现,
所以建议使用X-Real-IP获取真实Ip,
如果存在伪造Ip漏洞的话还需要Nginx配置一下X-Real-IP

当只有1层nginx代理情况下只需配置
“proxy_set_header X-Real-IP $remote_addr;”即可。

当有多层反向代理时，只在最外层代理设置
“proxy_set_header X-Real-IP $remote_addr;”，
如果在非最外层设置，则获取到的是反向代理机器的ip

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